![]() ![]() Define a gateway on each system other than the router.This guide covers using iptables, but you can also use other software. Configure the routing software on that same instance (the router).Enable IP forwarding on the Compute Instance designated as the router.One system should be designated as the router and should also be connected to the public internet or a different private network. All systems should be connected to the same private network, like a VLAN. Deploy at least 2 Compute Instances (or other virtual machines) to the same data center. ![]() Forward IPv6 addresses from a /56 routed range.Connect systems on two separate private VLANs.Connect systems on private VLAN to the public internet.Linode Compute Instances can be configured with up to 3 interfaces, each connecting to either the public internet or a private VLAN. This can make monitoring, controlling, and securing traffic much easier, as it can all be done from a single system. The router is configured with multiple network interfaces (one to the private VLAN and one to the other network) and forwards packets from one interface to another. Instead of giving each one their own interface to the other network, one system on the private network can act as a router. These systems might need access to an outside network, like other VLANs or the public internet. For example, it’s common practice for security-minded applications to connect most of their systems together through a private network, like a VLAN. Many workloads benefit from custom routing or port forwarding solutions, including those workloads hosted on cloud platforms like Linode. This guide covers how to configure a Linux system as a basic router, including enabling IP forwarding and configuring iptables. Using routing software like iptables, you have total control over configuring a router and firewall to suit your individual needs. Instead of using one of these pre-built solutions, you can create your own using any Linux server, like a Linode Compute Instance. Under the hood, these routers are stripped down computers running common operating systems, like Linux. In most cases, these solutions are preferred as they are relatively easy to configure, have lots of features, tend to have a user-friendly management interface, and may come with support options. There are lots of options for off-the-shelf router solutions for both home and enterprise. It’s able to identify where a particular packet should be delivered and then forward that packet over the appropriate network interface. It receives traffic from one network that is ultimately destined for another. A router is a system that acts as a intermediary between multiple different networks. To communicate with a computer that’s on a different network, a system needs a way to connect to that other network. A computer network is a collection of computer systems that can communicate with each other. ![]()
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